Please refer to this study by its ClinicalTrials.gov identifier: NCT00380068
| University of Alabama at Birmingham |
| Birmingham, Alabama, United States, 35294 |
| Arizona Pulmonary Specialist, Ltd |
| Phoenix, Arizona, United States, 85013 |
| Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center |
| Torrance, California, United States, 90502 |
| UCSD Medical Center |
| La Jolla, California, United States, 92037 |
| West Los Angeles HealthCare Center |
| Los Angeles, California, United States, 90073 |
| University of Colorado Health Science Center |
| Denver, Colorado, United States, 80262 |
| University of Connecticut Health Center |
| Farmington, Connecticut, United States, 06030 |
| Yale University School of Medicine |
| New Haven, Connecticut, United States, 06520 |
| Mount Sinai Medical Center of Florida, Inc |
| Miami Beach, Florida, United States, 33140 |
| Suncoast Lung Center |
| Sarasota, Florida, United States, 34233 |
| Atlanta Institute for Medical Research, Inc. |
| Decatur, Georgia, United States, 30030 |
| Medical College of Georgia |
| Augusta, Georgia, United States, 30912 |
| University of Chicago Hospitals |
| Chicago, Illinois, United States, 60637 |
| University of Iowa |
| Iowa City, Iowa, United States, 52242 |
| Johns Hopkins School of Medicine |
| Baltimore, Maryland, United States, 21205 |
| Massachusetts General Hospital |
| Boston, Massachusetts, United States, 02114 |
| Boston University Medical Center |
| Boston, Massachusetts, United States, 02118 |
| BACH Cardiology |
| Boston, Massachusetts, United States, 02115 |
| Tufts-New England Medical Center |
| Boston, Massachusetts, United States, 02111 |
| Wayne State University |
| Detroit, Michigan, United States, 48201 |
| Mayo Clinic |
| Rochester, Minnesota, United States, 55905 |
| Washington University in St. Louis |
| St. Louis, Missouri, United States, 63110-1093 |
| Newark Beth Israel Medical Center |
| Newark, New Jersey, United States, 07112 |
| UMDNJ Scleroderma Program |
| New Brunswick, New Jersey, United States, 08903 |
| University of Medicine & Dentistry New Jersey |
| Newark, New Jersey, United States, 07103 |
| New York Presbyterian Hospital |
| New York, New York, United States, 10032 |
| University of Rochester |
| Rochester, New York, United States, 14642 |
| Duke University Medical Center |
| Durham, North Carolina, United States, 27710 |
| The Lindner Clinical Trial Center |
| Cincinnati, Ohio, United States, 45219 |
| University of Cincinnati - College of Medicine |
| Cincinnati, Ohio, United States, 45267 |
| Cleveland Clinic Foundation |
| Cleveland, Ohio, United States, 44195 |
| University Hospitals of Cleveland |
| Cleveland, Ohio, United States, 44106 |
| Legacy Clinical Research & Technology Center |
| Portland, Oregon, United States, 97232 |
| University of Pittsburgh Medical Center Presbyterian |
| Pittsburgh, Pennsylvania, United States, 15213 |
| Allegheny General Hospital |
| Pittsburgh, Pennsylvania, United States, 15212 |
| Rhode Island Hospital |
| Providence, Rhode Island, United States, 02903 |
| Lexington Pulmonary and Critical Care |
| Lexington, South Carolina, United States, 29072 |
| Vanderbilt University Medical Center |
| Nashville, Tennessee, United States, 37232 |
| Baylor College of Medicine |
| Houston, Texas, United States, 77030 |
| UTHSC-SA |
| San Antonio, Texas, United States, 78229 |
| University of Virginia |
| Charlottesville, Virginia, United States, 22908 |
| Royal Perth Hospital |
| Perth, Australia, 6000 |
| St. Vincent's Hospital |
| Darlinghurst, New South Wales, Australia, 2010 |
| Peter Lougheed Center |
| Calgary, Alberta, Canada, T1Y 6J4 |
| University of Alberta Hospitals |
| Edmonton, Alberta, Canada, T6G 2B7 |
| London Health Sciences Centre, Victoria Hospital |
| London, Ontario, Canada, N6A 4W9 |
| Toronto General Hospital |
| Toronto, Ontario, Canada, M5G 2N2 |